Malicious PDF — malware analysis report

Static analysis result for SHA-256 957497aa2950a090…

MALICIOUS

PDF

71.4 KB Created: 2020-08-30 06:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f2f34e475bc83cb94c0a12a719399f SHA-1: 7c1966741b935af2e475474ca14f9927b83b6db4 SHA-256: 957497aa2950a090ed39c727045a746c6fd25bdb3a644d3103b76be2a3cba53f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that lead to a redirector URL, identified as malicious. The document body, though heavily obfuscated, contains the same redirector URL and a benign-looking PDF filename, suggesting a lure to trick users into clicking. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=pathfinder+skills+guide
    • https://static.usrfiles.com/ugd/8b2c09_9a324392a3de4b028c1830c5b08ec781.pdf
    • https://static.usrfiles.com/ugd/b8c837_dad603711759498baecad27aba6bcb64.pdf
    • https://static.usrfiles.com/ugd/b8c837_95420d694e0a40de886ba18e1d17b003.pdf
    • https://static.usrfiles.com/ugd/b444d4_6f582cc397f24b708aba39a53051ae07.pdf
    • https://static.usrfiles.com/ugd/086daf_94bded893db242afa82bbf5c6fa5f24c.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/36979530484.pdf
    • https://cdn.shopify.com/s/files/1/0431/1213/6855/files/60110195660.pdf
    • https://static.usrfiles.com/ugd/b8c837_a23303dda1464c76afcaca4c6ccba19b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d67ec2f2de2477b96a9c3a4be8db334.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_bdef487d5e3c4e82b21fe11cb534efb4.pdf
    • https://static.usrfiles.com/ugd/b65acf_3dc3fc14df2341d7b75c14af80daea38.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf9c.bin
c0fea54772e741ce48b7c38bd7ce2fdde91630fe80787e4296f3f581fba0f901		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9C 4004 bytes
font_01_sfnt_off0000cdbf.bin
0aa5831a3a2de8071fbe3bc5e81d1fb40323561ce82338c48aeced5afd53852b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 5004 bytes
font_02_sfnt_off0000dea9.bin
fc370ec96c18d46ffd8440df305f6e9d5bf0137aa598cbc63ee4566725c61a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10444 bytes
font_03_sfnt_off0001021f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 4324 bytes

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